# Lamb Wave-Based FDM-PPM Method Data Transmission Scheme in Plate Structures

## TL;DR

This paper introduces a new communication method using Lamb waves in metal plates to improve data transmission speed and reduce errors.

## Contribution

A novel FDM-PPM coding method is proposed to enhance Lamb wave communication rates and reduce energy consumption.

## Key findings

- The proposed method achieves a maximum transmission rate of 50 kbps.
- The system maintains a low bit error rate of 90.7%.
- It outperforms ASK and PPM in both speed and energy efficiency.

## Abstract

Lamb wave-based non-electromagnetic communication is an effective solution for real-time information exchange in health monitoring networks of large metallic plate structures. The multimodal nature, dispersive characteristics, and the influence of reflected waves during the propagation of Lamb waves severely limit the duration of communication signals. Within this constrained time, constructing communication signals reasonably is crucial for improving the transmission rate of Lamb wave acoustic data. A coding method based on frequency-division multiplexing–pulse-position modulation (FDM-PPM) is proposed to address the low transmission rate in Lamb wave communication systems. Experimental results demonstrate that the proposed Lamb wave communication system can achieve a maximum transmission rate of up to 50 kbps with a bit error rate as low as 90.7%. Compared with methods using Amplitude-Shift Keying (ASK) and pulse-position modulation (PPM), this method effectively enhances the transmission rate of the Lamb wave communication system while reducing the energy consumption of the excitation signal.